High-resolution observations of eight 3CR compact steep-spectrum radio sources

Spencer, R. E.; Schilizzi, R. T.; Fanti, C.; Fanti, R.; Parma, P.; Breugel, W. J. M. van; Venturi, T.; Muxlow, T. W. B.; Ren, Nan

doi:10.1093/mnras/250.1.225

Cited by 65 publications

(59 citation statements)

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“…Assuming a projected velocity of the order of that measured from the spectra (∼2100 km s −1 ), any displacement of the hot-spots with respect to radio core would be less than 0.1 . This is consistent with the observed radio morphology, in which the jet appears roughly straight (Spencer et al 1991). However, the hot-spots are slightly displaced with respect to the jet direction, displaying an S-shaped morphology.…”

Section: Relevant Timescales and Effects On The Observed Radio And Opsupporting

confidence: 90%

The puzzling case of the radio-loud QSO 3C 186: a gravitational wave recoiling black hole in a young radio source?

Chiaberge

Ely

Meyer

et al. 2017

A&A

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Context. Radio-loud active galactic nuclei with powerful relativistic jets are thought to be associated with rapidly spinning black holes (BHs). BH spin-up may result from a number of processes, including accretion of matter onto the BH itself, and catastrophic events such as BH-BH mergers. Aims. We study the intriguing properties of the powerful (L bol ∼ 10 47 erg s −1 ) radio-loud quasar 3C 186. This object shows peculiar features both in the images and in the spectra. Methods. We utilize near-IR Hubble Space Telescope (HST) images to study the properties of the host galaxy, and HST UV and Sloan Digital Sky Survey optical spectra to study the kinematics of the source. Chandra X-ray data are also used to better constrain the physical interpretation. Results. HST imaging shows that the active nucleus is offset by 1.3 ± 0.1 arcsec (i.e. ∼11 kpc) with respect to the center of the host galaxy. Spectroscopic data show that the broad emission lines are offset by −2140 ± 390 km s −1 with respect to the narrow lines. Velocity shifts are often seen in QSO spectra, in particular in high-ionization broad emission lines. The host galaxy of the quasar displays a distorted morphology with possible tidal features that are typical of the late stages of a galaxy merger. Conclusions. A number of scenarios can be envisaged to account for the observed features. While the presence of a peculiar outflow cannot be completely ruled out, all of the observed features are consistent with those expected if the QSO is associated with a gravitational wave (GW) recoiling BH. Future detailed studies of this object will allow us to confirm this type of scenario and will enable a better understanding of both the physics of BH-BH mergers and the phenomena associated with the emission of GW from astrophysical sources.

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Section: Relevant Timescales and Effects On The Observed Radio And Opsupporting

confidence: 90%

The puzzling case of the radio-loud QSO 3C 186: a gravitational wave recoiling black hole in a young radio source?

Chiaberge

Ely

Meyer

et al. 2017

A&A

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“…This component depolarises quickly with DP 14885/23285 = 0.51, while the RM rf is below 73 rad m −2 . This source has also been observed at 1.6, 5, and 8.4 GHz by Akujor & Garrington (1995) at sub-arcsecond resolution, and by Spencer et al (1991) with MERLIN and EVN at 18 cm, and Cotton et al (1995) at 1.7 and8.4 GHz 1829+290 (4C 29.56) -This source possesses a triple structure. The central component is the brightest and is polarised at both X-band and 15 GHz, while polarised emission is not detected at 23.2 GHz.…”

Section: −136 (Oq 172) -mentioning

confidence: 60%

“…Small values of the RM are found along the jet region, while a high value of RM is measured for the northern component. VLBI observations were reported by Nan et al (1991), Spencer et al (1991), and Fanti et al (2002). Polarimetric VLBI observations were performed by Mantovani et al (2003) at 8.4 GHz.…”

Section: +233 (3c 43) -mentioning

confidence: 99%

Radio polarimetry of compact steep spectrum sources at sub-arcsecond resolution

Mantovani

Rossetti

Junor

et al. 2013

A&A

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Aims. We report new Very Large Array (VLA) polarimetric observations of compact steep-spectrum (CSS) sources at 8.4, 15, and 23 GHz. Methods. Using multi-frequency VLA observations we have derived sub-arcsecond resolution images of the total intensity, polarisation, and rotation measure (RM) distributions.Results. We present multi-frequency VLA polarisation observations of CSS sources. About half of the sources are point-like even at the resolution of ∼0.1 × 0.1 arcsec. The remaining sources have double or triple structure. Low values for the percentage of polarised emission in CSS sources is confirmed. On the average, quasars are more polarised than galaxies. A wide range of RM values have been measured. There are clear indications of very large RMs up to ≈5585 rad m −2 . CSS galaxies are characterized by RM values that are larger than CSS quasars. The majority of the objects show very large values of RM. Conclusions. The available data on sub-arcsecond-scale rest-frame RM estimates for CSS sources show that these have a wide range of values extending up to ∼36 000 rad m −2 . RM estimates indicate an overall density of the magneto-ionic medium larger than classical radio sources.

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“…Compact steep spectrum sources and compact symmetric objects appear to show a high incidence of HI absorption (Conway 1996). High resolution radio observations of 3C 190 suggest one-sided jet-like structure towards the south-west of the core (Spencer et al 1991). The large scale jet in this direction is also brighter.…”

Section: Introductionmentioning

confidence: 91%

GMRT detection of HI 21 cm associated absorption towards thez = 1.2 red quasar 3C 190

Ishwara‐Chandra

Dwarakanath

Anantharamaiah

2003

J. Astrophys. Astr.

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We report the GMRT detection of associated HI 21 cm-line absorption in the z=1.1946 red quasar 3C 190. Most of the absorption is blue-shifted with respect to the systemic redshift. The absorption, at ∼ 647.7 MHz, is broad and complex, spanning a velocity width of ∼ 600 kms −1 . Since the core is self-absorbed at this frequency, the absorption is most likely towards the hotspots. Comparison of the radio and deep optical images reveal linear filaments in the optical which overlap with the brighter radio jet towards the south-west. We therefore suggest that most of the HI 21 cm-line absorption could be occurring in the atomic gas shocked by the south-west jet.

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High-resolution observations of eight 3CR compact steep-spectrum radio sources

Cited by 65 publications

References 0 publications

The puzzling case of the radio-loud QSO 3C 186: a gravitational wave recoiling black hole in a young radio source?

The puzzling case of the radio-loud QSO 3C 186: a gravitational wave recoiling black hole in a young radio source?

Radio polarimetry of compact steep spectrum sources at sub-arcsecond resolution

GMRT detection of HI 21 cm associated absorption towards thez = 1.2 red quasar 3C 190

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